一种测定水体甲烷消耗速率的新方法  

A New Method Employed to Determine the Methane Oxidation Rate in Water

作　　者：胡芳方 肖尚斌[1] 雷丹[1,2] 王雨春 HU Fangfang;XIAO Shangbin;LEI Dan;WANG Yuchun(College of Hydraulic&Environmental Engineering,China Three Gorges Univ.,Yichang 443002,China;School of Resource&Environmental Engineering,Wuhan Univ.of Technology,Wuhan 430070,China;Department of Water Environment,China Institute of Water Resources&Hydropower Research,Beijing 100038,China)

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]武汉理工大学资源与环境学院,武汉430070 [3]中国水利水电科学研究院,北京100038

出　　处：《三峡大学学报（自然科学版）》2020年第6期12-17,共6页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金项目(51979148)。

摘　　要：甲烷(CH4)作为第二重要的温室气体,其氧化作用是水柱中重要的碳汇.水生态系统CH4生成于厌氧条件的沉积物内部,在向上传输过程中,既能在表层沉积物中消耗,也能在水柱中被氧化,未被氧化的部分以自由扩散或气泡形式进入大气,成为大气CH4的主要来源.因此,准确地测量水体中CH4的消耗速率对于研究其环境因子制约以及在区域尺度上估算相应环境中的CH4通量具有重要意义.常用的传统测定方法存在成本高、耗时长、不易操作、气体多次转移过程中的系统误差等不足.本文介绍了一种新型的快速监测水体甲烷消耗速率的装置,该装置能在较短的时间分离水样中的溶存CH4,在15min基本实现CH4在水体和顶空气体间的平衡,与温室气体分析仪连接可测定水体CH4消耗速率.此方法重现性好、不使用环境毒害性试剂,较传统方法操作简便、耗时短、成本低且基本不存在人为误差.Methane(CH4)is the second most important greenhouse gas,and its oxidation in water column is an important carbon sink.In aquatic ecosystem,CH4 is produced in anaerobic sediments and oxidized in water column or surface sediments.Eventually,the unoxidized part enters the atmosphere by free diffusion or ebullition,becoming the main source of atmospheric CH4.It is of great significance to accurately measure the CH4 oxidation rate in water column for estimating the CH4 flux in corresponding area.However,traditional methods are subject to high cost,time consuming,complex operation,and systematic errors in multiple sample transfers.In this study,we present a new type of device connected to the greenhouse gas analyzer to determine the rate of CH4 oxidation in water,which can quickly reach an equilibrium between air and water in 15 minutes.This method has good reproducibility,with no use of environmentally toxic reagents as well as hardly any personal error,and is simpler,more time effective and economical than traditional methods.

关 键 词：甲烷 消耗速率 测定方法 

分 类 号：X524[环境科学与工程—环境工程]